Data documentation / v1.0
Methodology and data conventions
A transparent record of how each result is produced and what it does—and does not—represent.
Formula
Holdings equal investment amount divided by the selected entry price. Estimated value equals those holdings multiplied by the latest available price. Return is (latest price ÷ entry price − 1) × 100.
Entry-price conventions
Year open means the first available trading observation in that calendar year. Year low and high are the minimum and maximum observed values. GhostGains does not invent a price for market holidays.
Latest price and FX
The latest price is the last available observation on the date shown. Local-currency displays use a separate FX dataset, so the market-price and exchange-rate timestamps may differ.
What is excluded
Default results exclude taxes, commissions, bid–ask spreads, financing costs and inflation. Dividend and split treatment can depend on whether the underlying series is adjusted.
Source disclosure
The public web application receives normalized observations from the GhostGains market-data API. The upstream vendor identity and licensing terms are not exposed by the current API response, so GhostGains does not claim a vendor it cannot verify. This limitation will remain disclosed until provenance metadata is added.
Limitations and verification
Past performance does not predict future results. Vendor delays, missing observations and corporate-action adjustments can create differences, so users should verify figures against primary market records before making a decision.
Found a data issue?
Send the asset, year, displayed price and as-of date. Verifiable errors will be corrected.
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